Tert-butyl 2-oxo-1-oxa-3,8-diazaspiro[4.6]undecane-8-carboxylate 、
5-溴-2-硝基吡啶 以gave 3-(6-Nitro-pyridin-3-yl)-2-oxo-1-oxa-3,8-diaza-spiro[4.6]undecane-8-carboxylic acid tert-butyl ester as a brown solid (0.684 g, 1.743 mmol) in 92% yield的产率得到3-(6-nitropyridin-3-yl)-2-oxo-1-oxa-3,8-diazaspiro[4.6]undecane-8-carboxylic acid tert-butyl ester